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<h2><span class="refentrytitle"><a name="gobject-GTypeModule.top_of_page"></a>GTypeModule</span></h2>
<p>GTypeModule — Type loading modules</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="gobject-GTypeModule.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;glib-object.h&gt;

struct              <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule">GTypeModule</a>;
struct              <a class="link" href="gobject-GTypeModule.html#GTypeModuleClass" title="struct GTypeModuleClass">GTypeModuleClass</a>;
<a href="./../glib/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gobject-GTypeModule.html#g-type-module-use" title="g_type_module_use ()">g_type_module_use</a>                   (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gobject-GTypeModule.html#g-type-module-unuse" title="g_type_module_unuse ()">g_type_module_unuse</a>                 (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gobject-GTypeModule.html#g-type-module-set-name" title="g_type_module_set_name ()">g_type_module_set_name</a>              (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
<a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="returnvalue">GType</span></a>               <a class="link" href="gobject-GTypeModule.html#g-type-module-register-type" title="g_type_module_register_type ()">g_type_module_register_type</a>         (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> parent_type</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type_name</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Type-Information.html#GTypeInfo" title="struct GTypeInfo"><span class="type">GTypeInfo</span></a> *type_info</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GTypeFlags" title="enum GTypeFlags"><span class="type">GTypeFlags</span></a> flags</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gobject-GTypeModule.html#g-type-module-add-interface" title="g_type_module_add_interface ()">g_type_module_add_interface</a>         (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> instance_type</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> interface_type</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Type-Information.html#GInterfaceInfo" title="struct GInterfaceInfo"><span class="type">GInterfaceInfo</span></a> *interface_info</code></em>);
<a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="returnvalue">GType</span></a>               <a class="link" href="gobject-GTypeModule.html#g-type-module-register-enum" title="g_type_module_register_enum ()">g_type_module_register_enum</a>         (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Enumeration-and-Flag-Types.html#GEnumValue" title="struct GEnumValue"><span class="type">GEnumValue</span></a> *const_static_values</code></em>);
<a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="returnvalue">GType</span></a>               <a class="link" href="gobject-GTypeModule.html#g-type-module-register-flags" title="g_type_module_register_flags ()">g_type_module_register_flags</a>        (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Enumeration-and-Flag-Types.html#GFlagsValue" title="struct GFlagsValue"><span class="type">GFlagsValue</span></a> *const_static_values</code></em>);
#define             <a class="link" href="gobject-GTypeModule.html#G-DEFINE-DYNAMIC-TYPE:CAPS" title="G_DEFINE_DYNAMIC_TYPE()">G_DEFINE_DYNAMIC_TYPE</a>               (TN,
                                                         t_n,
                                                         T_P)
#define             <a class="link" href="gobject-GTypeModule.html#G-DEFINE-DYNAMIC-TYPE-EXTENDED:CAPS" title="G_DEFINE_DYNAMIC_TYPE_EXTENDED()">G_DEFINE_DYNAMIC_TYPE_EXTENDED</a>      (TypeName,
                                                         type_name,
                                                         TYPE_PARENT,
                                                         flags,
                                                         CODE)
#define             <a class="link" href="gobject-GTypeModule.html#G-IMPLEMENT-INTERFACE-DYNAMIC:CAPS" title="G_IMPLEMENT_INTERFACE_DYNAMIC()">G_IMPLEMENT_INTERFACE_DYNAMIC</a>       (TYPE_IFACE,
                                                         iface_init)
</pre>
</div>
<div class="refsect1">
<a name="gobject-GTypeModule.description"></a><h2>Description</h2>
<p>
<a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> provides a simple implementation of the <a class="link" href="gobject-GTypePlugin.html#GTypePlugin" title="GTypePlugin"><span class="type">GTypePlugin</span></a>
interface. The model of <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> is a dynamically loaded module
which implements some number of types and interface
implementations. When the module is loaded, it registers its types
and interfaces using <a class="link" href="gobject-GTypeModule.html#g-type-module-register-type" title="g_type_module_register_type ()"><code class="function">g_type_module_register_type()</code></a> and
<a class="link" href="gobject-GTypeModule.html#g-type-module-add-interface" title="g_type_module_add_interface ()"><code class="function">g_type_module_add_interface()</code></a>.  As long as any instances of these
types and interface implementations are in use, the module is kept
loaded. When the types and interfaces are gone, the module may be
unloaded. If the types and interfaces become used again, the module
will be reloaded. Note that the last unref can not happen in module
code, since that would lead to the caller's code being unloaded before
<a class="link" href="gobject-The-Base-Object-Type.html#g-object-unref" title="g_object_unref ()"><code class="function">g_object_unref()</code></a> returns to it.
</p>
<p>
Keeping track of whether the module should be loaded or not is done by
using a use count - it starts at zero, and whenever it is greater than
zero, the module is loaded. The use count is maintained internally by
the type system, but also can be explicitly controlled by
<a class="link" href="gobject-GTypeModule.html#g-type-module-use" title="g_type_module_use ()"><code class="function">g_type_module_use()</code></a> and <a class="link" href="gobject-GTypeModule.html#g-type-module-unuse" title="g_type_module_unuse ()"><code class="function">g_type_module_unuse()</code></a>. Typically, when loading
a module for the first type, <a class="link" href="gobject-GTypeModule.html#g-type-module-use" title="g_type_module_use ()"><code class="function">g_type_module_use()</code></a> will be used to load
it so that it can initialize its types. At some later point, when the
module no longer needs to be loaded except for the type
implementations it contains, <a class="link" href="gobject-GTypeModule.html#g-type-module-unuse" title="g_type_module_unuse ()"><code class="function">g_type_module_unuse()</code></a> is called.
</p>
<p>
<a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> does not actually provide any implementation of module
loading and unloading. To create a particular module type you must
derive from <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> and implement the load and unload functions
in <a class="link" href="gobject-GTypeModule.html#GTypeModuleClass" title="struct GTypeModuleClass"><span class="type">GTypeModuleClass</span></a>.
</p>
</div>
<div class="refsect1">
<a name="gobject-GTypeModule.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GTypeModule"></a><h3>struct GTypeModule</h3>
<pre class="programlisting">struct GTypeModule {
  GObject parent_instance;

  guint use_count;
  GSList *type_infos;
  GSList *interface_infos;

  gchar *name;
};
</pre>
<p>
The members of the <span class="structname">GTypeModule</span> structure should not 
be accessed directly, except for the <em class="parameter"><code>name</code></em> field.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="gobject-The-Base-Object-Type.html#GObject" title="struct GObject"><span class="type">GObject</span></a> <em class="structfield"><code><a name="GTypeModule.parent-instance"></a>parent_instance</code></em>;</span></p></td>
<td></td>
</tr>
<tr>
<td><p><span class="term"><a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GTypeModule.use-count"></a>use_count</code></em>;</span></p></td>
<td></td>
</tr>
<tr>
<td><p><span class="term"><a href="./../glib/glib/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> *<em class="structfield"><code><a name="GTypeModule.type-infos"></a>type_infos</code></em>;</span></p></td>
<td></td>
</tr>
<tr>
<td><p><span class="term"><a href="./../glib/glib/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> *<em class="structfield"><code><a name="GTypeModule.interface-infos"></a>interface_infos</code></em>;</span></p></td>
<td></td>
</tr>
<tr>
<td><p><span class="term"><a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GTypeModule.name"></a>name</code></em>;</span></p></td>
<td>the name of the module</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GTypeModuleClass"></a><h3>struct GTypeModuleClass</h3>
<pre class="programlisting">struct GTypeModuleClass {
  GObjectClass parent_class;

  gboolean (* load)   (GTypeModule *module);
  void     (* unload) (GTypeModule *module);
};
</pre>
<p>
In order to implement dynamic loading of types based on <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>, 
the <em class="parameter"><code>load</code></em> and <em class="parameter"><code>unload</code></em> functions in <a class="link" href="gobject-GTypeModule.html#GTypeModuleClass" title="struct GTypeModuleClass"><span class="type">GTypeModuleClass</span></a> must be implemented.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="gobject-The-Base-Object-Type.html#GObjectClass" title="struct GObjectClass"><span class="type">GObjectClass</span></a> <em class="structfield"><code><a name="GTypeModuleClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>the parent class</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GTypeModuleClass.load"></a>load</code></em> ()</span></p></td>
<td>loads the module and registers one or more types using
<a class="link" href="gobject-GTypeModule.html#g-type-module-register-type" title="g_type_module_register_type ()"><code class="function">g_type_module_register_type()</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GTypeModuleClass.unload"></a>unload</code></em> ()</span></p></td>
<td>unloads the module</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-type-module-use"></a><h3>g_type_module_use ()</h3>
<pre class="programlisting"><a href="./../glib/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            g_type_module_use                   (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>);</pre>
<p>
Increases the use count of a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> by one. If the
use count was zero before, the plugin will be loaded.
If loading the plugin fails, the use count is reset to 
its prior value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>module</code></em> :</span></p></td>
<td>a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="./../glib/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the plugin needed to be loaded and
loading the plugin failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-type-module-unuse"></a><h3>g_type_module_unuse ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                g_type_module_unuse                 (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>);</pre>
<p>
Decreases the use count of a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> by one. If the
result is zero, the module will be unloaded. (However, the
<a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> will not be freed, and types associated with the
<a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> are not unregistered. Once a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> is
initialized, it must exist forever.)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>module</code></em> :</span></p></td>
<td>a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-type-module-set-name"></a><h3>g_type_module_set_name ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                g_type_module_set_name              (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Sets the name for a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>module</code></em> :</span></p></td>
<td>a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>a human-readable name to use in error messages.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-type-module-register-type"></a><h3>g_type_module_register_type ()</h3>
<pre class="programlisting"><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="returnvalue">GType</span></a>               g_type_module_register_type         (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> parent_type</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *type_name</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Type-Information.html#GTypeInfo" title="struct GTypeInfo"><span class="type">GTypeInfo</span></a> *type_info</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GTypeFlags" title="enum GTypeFlags"><span class="type">GTypeFlags</span></a> flags</code></em>);</pre>
<p>
Looks up or registers a type that is implemented with a particular
type plugin. If a type with name <em class="parameter"><code>type_name</code></em> was previously registered,
the <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> identifier for the type is returned, otherwise the type
is newly registered, and the resulting <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> identifier returned.
</p>
<p>
When reregistering a type (typically because a module is unloaded
then reloaded, and reinitialized), <em class="parameter"><code>module</code></em> and <em class="parameter"><code>parent_type</code></em> must
be the same as they were previously.
</p>
<p>
As long as any instances of the type exist, the type plugin will
not be unloaded.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>module</code></em> :</span></p></td>
<td>a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent_type</code></em> :</span></p></td>
<td>the type for the parent class</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type_name</code></em> :</span></p></td>
<td>name for the type</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type_info</code></em> :</span></p></td>
<td>type information structure</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>flags field providing details about the type</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new or existing type ID</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-type-module-add-interface"></a><h3>g_type_module_add_interface ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                g_type_module_add_interface         (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> instance_type</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> interface_type</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Type-Information.html#GInterfaceInfo" title="struct GInterfaceInfo"><span class="type">GInterfaceInfo</span></a> *interface_info</code></em>);</pre>
<p>
Registers an additional interface for a type, whose interface lives
in the given type plugin. If the interface was already registered
for the type in this plugin, nothing will be done.
</p>
<p>
As long as any instances of the type exist, the type plugin will
not be unloaded.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>module</code></em> :</span></p></td>
<td>a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>instance_type</code></em> :</span></p></td>
<td>type to which to add the interface.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interface_type</code></em> :</span></p></td>
<td>interface type to add</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interface_info</code></em> :</span></p></td>
<td>type information structure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-type-module-register-enum"></a><h3>g_type_module_register_enum ()</h3>
<pre class="programlisting"><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="returnvalue">GType</span></a>               g_type_module_register_enum         (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Enumeration-and-Flag-Types.html#GEnumValue" title="struct GEnumValue"><span class="type">GEnumValue</span></a> *const_static_values</code></em>);</pre>
<p>
Looks up or registers an enumeration that is implemented with a particular
type plugin. If a type with name <em class="parameter"><code>type_name</code></em> was previously registered,
the <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> identifier for the type is returned, otherwise the type
is newly registered, and the resulting <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> identifier returned.
</p>
<p>
As long as any instances of the type exist, the type plugin will
not be unloaded.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>module</code></em> :</span></p></td>
<td>a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>name for the type</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>const_static_values</code></em> :</span></p></td>
<td>an array of <a class="link" href="gobject-Enumeration-and-Flag-Types.html#GEnumValue" title="struct GEnumValue"><span class="type">GEnumValue</span></a> structs for the
possible enumeration values. The array is
terminated by a struct with all members being
0.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new or existing type ID</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.6</p>
</div>
<hr>
<div class="refsect2">
<a name="g-type-module-register-flags"></a><h3>g_type_module_register_flags ()</h3>
<pre class="programlisting"><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="returnvalue">GType</span></a>               g_type_module_register_flags        (<em class="parameter"><code><a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a> *module</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="gobject-Enumeration-and-Flag-Types.html#GFlagsValue" title="struct GFlagsValue"><span class="type">GFlagsValue</span></a> *const_static_values</code></em>);</pre>
<p>
Looks up or registers a flags type that is implemented with a particular
type plugin. If a type with name <em class="parameter"><code>type_name</code></em> was previously registered,
the <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> identifier for the type is returned, otherwise the type
is newly registered, and the resulting <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> identifier returned.
</p>
<p>
As long as any instances of the type exist, the type plugin will
not be unloaded.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>module</code></em> :</span></p></td>
<td>a <a class="link" href="gobject-GTypeModule.html#GTypeModule" title="struct GTypeModule"><span class="type">GTypeModule</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>name for the type</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>const_static_values</code></em> :</span></p></td>
<td>an array of <a class="link" href="gobject-Enumeration-and-Flag-Types.html#GFlagsValue" title="struct GFlagsValue"><span class="type">GFlagsValue</span></a> structs for the
possible flags values. The array is
terminated by a struct with all members being
0.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new or existing type ID</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.6</p>
</div>
<hr>
<div class="refsect2">
<a name="G-DEFINE-DYNAMIC-TYPE:CAPS"></a><h3>G_DEFINE_DYNAMIC_TYPE()</h3>
<pre class="programlisting">#define G_DEFINE_DYNAMIC_TYPE(TN, t_n, T_P)          G_DEFINE_DYNAMIC_TYPE_EXTENDED (TN, t_n, T_P, 0, {})
</pre>
<p>
A convenience macro for dynamic type implementations, which declares a
class initialization function, an instance initialization function (see 
<a class="link" href="gobject-Type-Information.html#GTypeInfo" title="struct GTypeInfo"><span class="type">GTypeInfo</span></a> for information about these) and a static variable named 
<em class="parameter"><code>t_n</code></em>_parent_class pointing to the parent class. Furthermore, 
it defines a <code class="function">*_get_type()</code> and a static 
<code class="function">*_register_type()</code> function for use in your
<code class="function"><code class="function">module_init()</code></code>.
See <a class="link" href="gobject-GTypeModule.html#G-DEFINE-DYNAMIC-TYPE-EXTENDED:CAPS" title="G_DEFINE_DYNAMIC_TYPE_EXTENDED()"><code class="function">G_DEFINE_DYNAMIC_TYPE_EXTENDED()</code></a> for an example.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>TN</code></em> :</span></p></td>
<td>The name of the new type, in Camel case.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>t_n</code></em> :</span></p></td>
<td>The name of the new type, in lowercase, with words
separated by '_'.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>T_P</code></em> :</span></p></td>
<td>The <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> of the parent type.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.14</p>
</div>
<hr>
<div class="refsect2">
<a name="G-DEFINE-DYNAMIC-TYPE-EXTENDED:CAPS"></a><h3>G_DEFINE_DYNAMIC_TYPE_EXTENDED()</h3>
<pre class="programlisting">#define             G_DEFINE_DYNAMIC_TYPE_EXTENDED(TypeName, type_name, TYPE_PARENT, flags, CODE)</pre>
<p>
A more general version of <a class="link" href="gobject-GTypeModule.html#G-DEFINE-DYNAMIC-TYPE:CAPS" title="G_DEFINE_DYNAMIC_TYPE()"><code class="function">G_DEFINE_DYNAMIC_TYPE()</code></a> which
allows to specify <a class="link" href="gobject-Type-Information.html#GTypeFlags" title="enum GTypeFlags"><span class="type">GTypeFlags</span></a> and custom code.
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
G_DEFINE_DYNAMIC_TYPE_EXTENDED (GtkGadget,
                                gtk_gadget,
                                GTK_TYPE_THING,
                                0,
                                G_IMPLEMENT_INTERFACE_DYNAMIC (TYPE_GIZMO,
                                                               gtk_gadget_gizmo_init));
</pre></div>
<p>
expands to
</p>
<div class="informalexample"><pre class="programlisting">
static void     gtk_gadget_init              (GtkGadget      *self);
static void     gtk_gadget_class_init        (GtkGadgetClass *klass);
static void     gtk_gadget_class_finalize    (GtkGadgetClass *klass);

static gpointer gtk_gadget_parent_class = NULL;
static GType    gtk_gadget_type_id = 0;

static void     gtk_gadget_class_intern_init (gpointer klass)
{
  gtk_gadget_parent_class = g_type_class_peek_parent (klass); 
  gtk_gadget_class_init ((GtkGadgetClass*) klass); 
}

GType
gtk_gadget_get_type (void)
{
  return gtk_gadget_type_id;
}

static void
gtk_gadget_register_type (GTypeModule *type_module)
{
  const GTypeInfo g_define_type_info = {
    sizeof (GtkGadgetClass),
    (GBaseInitFunc) NULL,
    (GBaseFinalizeFunc) NULL,
    (GClassInitFunc) gtk_gadget_class_intern_init,
    (GClassFinalizeFunc) gtk_gadget_class_finalize,
    NULL,   // class_data
    sizeof (GtkGadget),
    0,      // n_preallocs
    (GInstanceInitFunc) gtk_gadget_init, 
    NULL    // value_table
  };
  gtk_gadget_type_id = g_type_module_register_type (type_module,
                                                    GTK_TYPE_THING,
                                                    GtkGadget,
                                                    &amp;g_define_type_info,
                                                    (GTypeFlags) flags);
  {
    const GInterfaceInfo g_implement_interface_info = {
      (GInterfaceInitFunc) gtk_gadget_gizmo_init
    };
    g_type_module_add_interface (type_module, g_define_type_id, TYPE_GIZMO, &amp;g_implement_interface_info);
  }
}
</pre></div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>TypeName</code></em> :</span></p></td>
<td>The name of the new type, in Camel case.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type_name</code></em> :</span></p></td>
<td>The name of the new type, in lowercase, with words
separated by '_'.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>TYPE_PARENT</code></em> :</span></p></td>
<td>The <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> of the parent type.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>
<a class="link" href="gobject-Type-Information.html#GTypeFlags" title="enum GTypeFlags"><span class="type">GTypeFlags</span></a> to pass to <a class="link" href="gobject-GTypeModule.html#g-type-module-register-type" title="g_type_module_register_type ()"><code class="function">g_type_module_register_type()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>CODE</code></em> :</span></p></td>
<td>Custom code that gets inserted in the *_get_type() function.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.14</p>
</div>
<hr>
<div class="refsect2">
<a name="G-IMPLEMENT-INTERFACE-DYNAMIC:CAPS"></a><h3>G_IMPLEMENT_INTERFACE_DYNAMIC()</h3>
<pre class="programlisting">#define             G_IMPLEMENT_INTERFACE_DYNAMIC(TYPE_IFACE, iface_init)</pre>
<p>
A convenience macro to ease interface addition in the <em class="parameter"><code>_C_</code></em> section
of <a class="link" href="gobject-GTypeModule.html#G-DEFINE-DYNAMIC-TYPE-EXTENDED:CAPS" title="G_DEFINE_DYNAMIC_TYPE_EXTENDED()"><code class="function">G_DEFINE_DYNAMIC_TYPE_EXTENDED()</code></a>. See <a class="link" href="gobject-GTypeModule.html#G-DEFINE-DYNAMIC-TYPE-EXTENDED:CAPS" title="G_DEFINE_DYNAMIC_TYPE_EXTENDED()"><code class="function">G_DEFINE_DYNAMIC_TYPE_EXTENDED()</code></a>
for an example.
</p>
<p>
Note that this macro can only be used together with the
G_DEFINE_DYNAMIC_TYPE_EXTENDED macros, since it depends on variable
names from that macro.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>TYPE_IFACE</code></em> :</span></p></td>
<td>The <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> of the interface to add</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iface_init</code></em> :</span></p></td>
<td>The interface init function</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
</div>
<div class="refsect1">
<a name="gobject-GTypeModule.see-also"></a><h2>See Also</h2>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="gobject-GTypePlugin.html#GTypePlugin" title="GTypePlugin"><span class="type">GTypePlugin</span></a></span></p></td>
<td><p>The abstract type loader interface.</p></td>
</tr>
<tr>
<td><p><span class="term"><a href="./../glib/glib/glib-Dynamic-Loading-of-Modules.html#GModule"><span class="type">GModule</span></a></span></p></td>
<td><p>Portable mechanism for dynamically loaded modules.</p></td>
</tr>
</tbody>
</table></div>
</div>
</div>
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